Error type

What went wrong?

Examples

Invalid cases

Unrecognizable strings or dates containing illegal element values in ISO formatted strings usually return NaN. However, depending on the implementation, non–conforming ISO format strings, may also throw RangeError: invalid date, like the following cases in Firefox:

new Date('foo-bar 2014');
new Date('2014-25-23').toISOString();
new Date('foo-bar 2014').toString();